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Abstract
A Landau-type theory has been applied to the description of the T N=330±20 mK magnetic phase transition in the high temperature superconductor YbBa 2Cu 3O 7. It has been demonstrated that the magnetic order parameter is one-dimensional and that the magnetic ordering has a three-dimensional Ising character. All possible (symmetry allowable) low-temperature spin structures were subsequently determined. They are antiferromagnetic, with the magnetic moments directed along the basis vectors of the Bravais lattice and they exactly fulfil the non-linear differential equations which follow from the variational problem for the thermodynamic potential density. One of the obtained spin structures is identical to that for which B. Roessli et al. obtained the best fit to the experimental diffraction pattern. The domain structure of the superconductor was subsequently determined on the grounds of Landau symmetry considerations.
Published Version
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